<div class="row ss">
    <div class="col-md-2">
        <nav class="nav flex-column ">
            <a class="nav-link active" [routerLink]="['user']">用户管理</a>
            <a class="nav-link" [routerLink]="['product']">产品管理</a>
            <a class="nav-link" [routerLink]="['exit']">退出</a>
        </nav>
    </div>


    <div class="col-md-9">
        <router-outlet></router-outlet>
    </div>
</div>